Looking at the cheats for the PS3, they seem suspiciously similar to the GTA:SA cheats? As in identical, I also don't see why they would go back to the old school button combos when the phone set up from GTAIV worked so well and meant the cheats were the same across multiple platforms

I like the idea of turbulence, can see it coming in to play really well in air races, you're fighting for first place and suddenly you and the plane in front hit a patch of turbulence, your controller starts to shake like an epileptic at a disco and you desperately fight for control and claw your way back into the air breathing a sigh of relief, only to look over and see the other plane spiral down into the ground and explode.....

I've said it before and it's been discussed at length previously, but I still think Rock* will do a DLC from the point of view of a cop, either trying to bring Michael, Franklin & Trevor down or working with them.

I'd love either an abandoned bomb/fallout shelter or a cave, somewhere completely off the grid that I can stock with weaponry and my tricked out but beat up looking truck, and the idea of an old huey type chopper appeals to me

SMG category could be represented by the "Carbine Rifle" as a carbine is a shortened rifle adapted for manoeuvrability, it seems logical to me that you could have one of those OR a true SMG like an MP-5 or Vector

Rockstar has stated they took a lot of inspiration form the film Heat, and I recall seeing a casting call asking for an FBI/FIB agent, so a DLC from a cops point of view wouldn't be a massive surprise, albeit a cop with serious authority issues and a penchant for shooting the place up.